Statistics The sales manager for a large appliance retailer, is measuring his radio advertising campaign featuring major appliances. Over the last 7 weeks he has purchased varying amounts of radio time (line X,  in minutes). Line Y displays the number of major appliances sold that week. X (minutes) 25 18 32 21 35 28 30 Y 16 11 20 15 26 32 20    

Expert Answers

An illustration of the letter 'A' in a speech bubbles

There is a handy online calculator that can help you do this, so that after you do it by hand you can check your work.  Here is the link.  Find the mean, which this gives you (add up the numbers and divide by the number of numbers).  Subtract the mean from each number to get the deviations.  Square those numbers.  Add the squares, divide by the total minus one.  Take the square root.

Approved by eNotes Editorial Team

We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

  • 30,000+ book summaries
  • 20% study tools discount
  • Ad-free content
  • PDF downloads
  • 300,000+ answers
  • 5-star customer support
Start your 48-Hour Free Trial